THE SCIENTIFIC AMERICAN DIGEST
extraordinary specimen of lodestone, weighing more than 400 pounds, and possessing unusually powerful magnetic strength, has been placed on exhibition in the department of geology at Field Mu· seum of Natural History. The huge natural The average boy who likes to mys· tify his friends would give his...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.363.9262 http://www.nature.com/scientificamerican/journal/v143/n6/pdf/scientificamerican1230-466.pdf |